12_Ch 22 College Physics ProblemCH22 Reflection and Refraction of Light

244CHAPTER 22 22.18At the first surface, the angle of incidence is 130.0θ=°, and Snell’s law gives ()11121.00 sin30.0sinsinsin19.51.50airglassnn−−°===1°Since the second surface is parallel to the first, the angle of incidence at the second surface is =19.5°and the angle of refraction is ( )2sin1.50 sin19.5sin30.01.00ssglassairn°singlan=°Thus, the light emerges traveling parallel to the incident beam. 22.19The angle of refraction at the first surface is 219.5=°(see Problem 18). Let hrepresent the distance from point ato c(that is, the hypotenuse of triangle abc). Then, 22.00 cm

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